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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.5
Absolute: -2.8
Spectral ClassB3V Blue Dwarf
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star

A blue dwarf star with an unusual spectrum, Achernar has a magnitude of +0.5, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The River's End: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

HR Diagram
Liesma
YZ Ceti
Miram
Mekbuda
w Carinae
x Carinae
s Velorum A
Polis
Poerava
Struve 2398 A
Struve 2398 B
π Cephei
Rukbat
Rastaban
Sharjah
Rana
θ Hydrae
Nashira
ο1 Cygni
b Velorum
Cerberus
Copernicus
β Reticuli
BF Orionis
41 Draconis
Alkaphrah
Acubens
a Velorum
Adhafera
Guniibuu
GX Andromedae
HD 37131
GQ Andromedae
Koeia
La Superba
ι1 Scorpii
HR 5546
HR 6682
ε Indi
Erakis
Ebla
Dombay
Felixvarela
Almaaz
61 Cygni B
Castor B
61 Cygni A
τ Ceti
Caph
Aspidiske
Capella
Menkar
Canopus
BZ Crucis
Rigel
α Centauri A
Wolf 498
Wolf 359
Meissa A
π5 Orionis
Mebsuta
Tarazed
δ Andromedae
δ Caeli
Lalande 18115
Dabih Major
Sulafat
ζ Trianguli Australis
δ Circini
15 Orionis
Kitalpha
Deneb Algedi
Polaris
δ Pavonis
Suhail
Ran
Arneb
χ Cygni
Zaniah
Deneb
Wezen
α Telescopii
Ross 154
Schedar
U Sagittarii
Sargas
Alchiba
ε Reticuli
Tureis
Gliese 536
σ Orionis
HO Librae
Alfirk
W Virginis
HH Andromedae
Alnitak
Alnilam
η Carinae
β Doradus
Sham
Hatysa
ο Capricorni B
Naos
WX Ursae Majoris
Azmidi
ν2 Canis Majoris
Achird
Sirius B
Betelgeuse
van Maanen's Star
HR 7687
Mira
Proxima Centauri
EE Leonis
V626 Arae
Mirfak
Unurgunite
UV Ceti
Sirius
Atria
Avior
Enif
Teegarden's Star
Antares
Sadr
Saiph
ρ Cygni
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

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